ABSTRACT

This paper exploits the hygroscopic properties of wood and its passive response to fluctuation of relative humidity to develop a framework for programmable actuation in adaptive building façade design. This responsive shape shifting mechanism is specifically employed for the embedded actuation of dynamic shading configurations. Utilizing the hygroscopic properties of wood in adaptive shading devices embraces passive motion with a low-cost and low-tech approach, as a response to rapid climatic changes. Using physical experiments and image analysis, changes in the deflection and angle of curvature of wood samples in response to fluctuation in relative humidity were measured and tracked. A set of controlled hygroscopic parameters affecting the motion response of wood were deduced, including the fixation position, fixation type, and percentage and location of isolated areas of wood samples, thus achieving more control of response behavior and multiple shading percentages. A parametric script was developed using Grasshopper graphical algorithm editor and Ladybug environmental plugin to simulate shading configurations for the identified control parameters in the summer and winter solstices for an adaptive façade prototype.

摘要

本文利用木材的吸湿特性及其对相对湿度波动的被动响应，为自适应建筑立面设计中的可编程驱动开发了一个框架。这种响应式变形机制专门用于动态阴影配置的嵌入式驱动。在自适应遮阳设备中利用木材的吸湿特性，以低成本和低技术的方法进行被动运动，以应对快速的气候变化。使用物理实验和图像分析，测量和跟踪木材样品的挠度和曲率角响应相对湿度波动的变化。推导出一组影响木材运动响应的受控吸湿参数，包括固定位置、固定类型、以及木材样品孤立区域的百分比和位置，从而更好地控制响应行为和多个阴影百分比。使用 Grasshopper 图形算法编辑器和 Ladybug 环境插件开发了一个参数化脚本，以模拟夏至和冬至的自适应外观原型的已识别控制参数的阴影配置。